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Hydraulic fluids

Inactive Publication Date: 2007-04-05
NICHE PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0046] The aqueous hydraulic fluids of the invention contain less than 20% wt of a mineral oil, synthetic hydrocarbon oil, or any mixture thereof. In order to incorporate oleophilic lubricants into hydraulic fluids, it has been generally necessary to introduce mineral oils or synthetic hydrocarbon oils at a relatively high concentration. The inventors have surprisingly found that aqueous hydraulic fluids can be manufactured which utilises oleophilic phospholipids as a primary lubricant without the need to introduce large, small, or even trace quantities of oils, especially mineral or synthetic hydrocarbon oils. The use of an aqueous base rather than an oil base for the hydraulic fluid also effects superior environmental characteristics to the fluid, especially for applications such as off-shore and undersea mining and exploration fields.

Problems solved by technology

The level of importance of this depends on the application as some systems are very prone to such issues.

Method used

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Examples

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example 1

[0052] An aqueous hydraulic fluid of the invention (Formulation A) was prepared by mixing the following ingredients then homogenising this mixture under pressures of between 500-5,000 psi until a stable dispersion was achieved. The resultant product was then filtered to remove any large particles: [0053] 10% w / w Soybean Lecithin, supplied by Cargill PLC, UK [0054] 0.1% w / w Benzotriazole, supplied by Ellis and Everard PLC (UNIVAR), UK [0055] 0.1% w / w EDTA, supplied by BASF PLC, UK [0056] 10% Decanoic Acid(supplied by Multisol, UK) / TEA (supplied by Univar, UK), pre-neutralised salt to pH 8.8 [0057] 5% w / w Triazene, supplied by Thor Chemicals, UK [0058] 40% w / w Monoethylene Glycol, supplied by Ellis & Everard PLC, (Univar), UK [0059] Water to balance

[0060] This formulation, hereinafter referred to as Formulation A, is utilised as a BOP hydraulic fluid concentrate that is diluted by the consumer prior to use, typically to a working concentration of 20% v / v in water and antifreeze mix, ...

example 2

[0074] A second preferred embodiment of the aqueous hydraulic fluid of the invention, Formulation B, was prepared by mixing the following ingredients then homogenising this mixture under pressures of between 500-5,000 psi until a stable dispersion was achieved. Resultant product was then filtered to remove any large particles: [0075] 2% w / w Soybean Lecithin [0076] 0.01% w / w Benzotriazole [0077] 0.01% w / w EDTA [0078] 0.5% Decanoic Acid / TEA, pre-neutralised salt to pH 8.8 [0079] 0.3% w / w Triazene [0080] 40% w / w Monoethylene Glycol [0081] Water to balance

[0082] The above mentioned formulation is hereinafter called Formulation B.

[0083] Formulation B was subjected to the Falex Lupricity Test as described above, and exhibited similar performance to Formulation A. The results showed that Formulation B provided effective water based hydraulic fluid for the off-shore and mining fields.

[0084] The aqueous hydrocarbon fluid of the invention exhibit excellent environmental characteristics, an...

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Abstract

Invention relates to an aqueous hydraulic fluid comprising, in addition to water, at least one phospholipid lubricant, wherein the hydraulic fluid comprises less than 20% by weight of an oil selected from a mineral oil, a synthetic hydrocarbon oil or any mixture thereof. Preferably the or each phospholipid lubricant comprises a plant-derived lecithin.

Description

FIELD OF THE INVENTION [0001] This invention relates to hydraulic fluids, and in particular, but not exclusively, to hydraulic fluids for use in the offshore oil and gas industry. BACKGROUND TO THE INVENTION [0002] When drilling for subsea oil, it is normal for a drilling rig to drill a hole in the seabed in search for the oil reserves. After drilling down a specified distance, it is common to place a BOP stack on the wellhead on the seabed and then continue to drill through the center of the BOP unit. The Blow-Out Preventor (BOP) stack is in simple terms, a hydraulically operated safety device that can shut down the well if a gas pocket or oil is discovered (a blow out). The unit works by hydraulic pressure that can be used to seal the gap between the drill string (which turns the head of the drill and connects to the drilling rig) by either forming a seal against the drill string or slicing through the drill string in more dangerous situations. The sealing and slicing operation is...

Claims

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Application Information

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IPC IPC(8): C10M173/00C10M173/02C09K8/34
CPCC09K8/34C10M173/02C10M2223/10C10N2230/64C10N2240/08
Inventor ASKEW, ANTHONY DEAN
Owner NICHE PRODS
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